CN214043784U

CN214043784U - Lithium battery energy storage system capable of effectively preventing thermal runaway

Info

Publication number: CN214043784U
Application number: CN202120153839.4U
Authority: CN
Inventors: 王剑; 钱明益; 李劲超; 周宁; 范圣杰
Original assignee: SUZHOU DURAPOWER TECHNOLOGY CO LTD
Current assignee: SUZHOU DURAPOWER TECHNOLOGY CO LTD
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2021-08-24
Anticipated expiration: 2031-01-20

Abstract

The utility model relates to a can prevent effectively lithium cell energy storage system of thermal runaway, panel on one side is established including box and lid, be provided with accommodation space in the box, be provided with the battery module in the accommodation space, the panel encloses accommodation space into airtight space, the box includes two-layer protective housing at least, the medicament of putting out a fire has been placed in the protective housing, the boiling temperature of the medicament of putting out a fire is far less than the temperature of module thermal runaway, the chain reaction of burning can be interrupted in the free radical that the medicament thermal decomposition of putting out a fire produced and the active free radical reaction in the burning, still be provided with battery management system and positive, negative pole post on the panel, battery management system and positive, negative pole post all with battery module electric connection; the fire extinguishing agent in the protective shell has low vaporization temperature, ensures the temperature equalization in the box body, and absorbs the heat of the thermal runaway battery through vaporization for the first time. The heat transfer is reduced, the safety of the battery system is ensured, and meanwhile, limited oxygen in the closed space is consumed. In addition, the energy storage system has few components and good safety performance.

Description

Lithium battery energy storage system capable of effectively preventing thermal runaway

Technical Field

The utility model relates to a lithium battery energy storage system especially can effectively prevent thermal runaway's lithium battery energy storage system.

Background

Present container formula's lithium cell energy storage adopts air-cooled battery thermal management system mostly, and the diaphragm of lithium cell is receiving when a certain amount of heat, often contracts, and then leads to the battery thermal runaway, reacts with the oxygen in the air in the box, forms conflagration on a large scale, and current centralized formula ware of putting out a fire lacks effective intervention means to early thermal runaway. Fail to provide a first time safety precaution. When confirming the conflagration through the temperature sensing, when the smoke is felt, often take place the large tracts of land and stretch, join in marriage traditional conflagration release technique again, the fire extinguishing agent can't arrive near the electric core of thermal runaway near the very first time and realize putting out a fire, and the biggest problem of lithium cell thermal runaway is because it can continuously produce the heat, very easily arouse the after combustion, traditional release technique is with fire extinguishing agent uniform release in whole space, along with the fire extinguishing agent receives the effect of gravity to sink, it is difficult to keep higher suppression concentration in longer a period near the thermal runaway battery, can not fully utilize accurately limited fire extinguishing agent resource.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a can effectively prevent lithium cell energy storage system of thermal runaway, the problem that the thermal management system of having solved current container formula lithium cell can not prevent and handle early thermal runaway.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

the utility model provides a can effectively prevent lithium cell energy storage system of thermal runaway, wherein, the power distribution box comprises a box body, be provided with accommodation space in the box, be provided with the battery module in the accommodation space, a side cover of box is equipped with the panel, the panel will accommodation space encloses into airtight space, the medicament of putting out a fire has been installed to the box, the boiling temperature of the medicament of putting out a fire is far less than the temperature of battery module thermal runaway, the medicament vaporization of putting out a fire is certain heat of absorption, the chain reaction of the active free radical reaction interruptible burning in the free radical that the medicament thermal decomposition of putting out a fire produced and the burning, still be provided with Battery Management System (BMS) and positive and negative utmost point post on the panel, Battery Management System (BMS) and positive and negative utmost point post all with battery module electric connection.

Preferably, the volume of the fire extinguishing agent is greater than 10% of the volume of the accommodating space after the battery module is removed.

Preferably, the fire extinguishing agent is heptafluoropropane or hexafluoropropane in composition.

Preferably, the liquid filling device further comprises a liquid filling port and a liquid level meter, wherein the liquid filling port and the liquid level meter are located on the periphery of the panel or the box body.

Preferably, the battery module is fixed with the box body through a limiting block, and an elastic buffering material is further arranged between the limiting block and the battery module.

Preferably, the box is preferably an aluminum profile box or a cast aluminum box.

Preferably, a sealing ring is further arranged between the box body and the panel; the sealing ring is arranged at the opening of the box body.

Preferably, the sealing ring is made of ethylene propylene diene monomer, and the contact surface of the sealing ring and the panel is wavy.

Preferably, an elastic buffer is arranged between the battery module and the bottom of the box body.

Preferably, the case includes at least two protective cases, and the fire extinguishing agent is installed between the protective cases.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the utility model discloses a can prevent effectively lithium cell energy storage system of thermal runaway, establish the panel in box one side including box and lid, be provided with accommodation space in the box, be provided with battery module in the accommodation space, the panel is established into airtight space with this accommodation space lid, still installed the medicament of putting out a fire in the box, the boiling temperature of the medicament of putting out a fire is far less than the temperature of battery module thermal runaway, the boiling point of the medicament of generally putting out a fire is between 40~50 ℃, and absorb certain heat when the medicament of putting out a fire volatilizees, and the chain reaction of the active free radical reaction interruptible burning in free radical and the burning when putting out a fire the medicament thermal decomposition production, consume oxygen promptly. The panel is also provided with a Battery Management System (BMS), a positive pole and a negative pole, the Battery Management System (BMS), the positive pole and the negative pole are electrically connected with the battery module, the Battery Management System (BMS) can control the battery core in the module to a certain degree, and the positive pole and the negative pole can be used for charging and discharging the battery; the fire extinguishing agent has low vaporization temperature, forms a heat pipe effect, ensures the temperature equalizing performance in the box body, and absorbs the heat of the thermal runaway battery through vaporization at the first time. The heat transfer is reduced, the safety of the battery system is ensured, and meanwhile, limited oxygen in the closed space is consumed. In addition, the energy storage system has the advantages of few components, low cost and good safety performance.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another view angle according to an embodiment of the present invention.

Wherein the reference numerals are as follows:

1. a box body; 2. a battery module; 3. a panel; 4. a limiting block; 5. an elastic buffer member; 6. a seal ring; 7. a positive pole column, 8 and a negative pole column; 9. a liquid level meter; 10 liquid injection port; 11. a communication jack; 12. Heat dissipation fins; 13. a cushioning elastomeric material.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, the embodiment of the present invention includes a box 1, a side cover of the box 1 is provided with a panel 3, and the panel 3 and the box 1 are connected by screws, so that the assembly and disassembly can be performed. Be provided with accommodation space in the box 1, panel 3's lid is established so that accommodation space becomes airtight space, be provided with battery module 2 in the accommodation space, battery module 2 comprises a plurality of electric cores, battery module 2 is fixed through stopper 4 and box 1, stopper 4 sets up the one side that is close to panel 3 at battery module 2, be provided with a plurality of screws on stopper 4, the screw connection is on box 1, prescribe battery module 2, still be provided with the elastic buffer material between stopper 4 and the battery module 2, in order to prevent stopper scratch battery module 2, cause the damage. The battery module 2 is far away from one side of the panel 3, an elastic buffer piece 5 is also arranged between the box body 1 and the battery module 2, and the battery module 2 can be prevented from being scratched by the box body 1, so that certain buffering can be realized during collision. The outer protection shell of the box body 1 is preferably an aluminum box body or a cast aluminum box body, and the aluminum box body has good heat dissipation performance.

The protection casing of box 1 is including two-layer at least, and the medicament dress of putting out a fire is between two-layer protection casing, and the medicament of putting out a fire has carried out the encirclement with airtight space, and the area greatly increased of laying of the medicament of putting out a fire, the opening part of protection casing still are provided with sealing washer 6, and the setting of sealing washer 6 covers the protection casing, covers again and establishes top panel 3 and will protect the casing and seal. The leakage of the fire extinguishing agent and the entrance of external oxygen are prevented, and the outward volatilization of the gas generated by the fire extinguishing agent is also prevented. The sealing ring 6 is made of ethylene propylene diene monomer material, and the ethylene propylene diene monomer material has the characteristics of strong oxidation resistance, ozone resistance and corrosion resistance. Meanwhile, the contact surface of the sealing ring 6 and the panel 3 is wavy, and the wavy structure enables the sealing performance to be more excellent.

Still including annotating liquid mouth 10 on the panel 3, it is located panel 3 to annotate liquid mouth 10, when panel 3 lid was established on box 1, the injection of the medicament of conveniently putting out a fire, the boiling point of the medicament of putting out a fire is low, easy vaporization, the medicament of putting out a fire can absorb certain heat when the vaporization on the one hand, on the other hand can be in the chain reaction of the active free radical reaction interruptible combustion in the free radical that thermal decomposition produced and the combustion, absorb the oxygen in the airtight space promptly, the condition of combustion is two usually, has suitable temperature and has a certain amount of oxygen, the utility model discloses these two problems have been solved simultaneously, just avoided battery module 2's thermal runaway in early, can be with the temperature control in the airtight space in a reasonable scope. The volume content of the fire extinguishing agent in one box body is more than 10% of the volume of the accommodating space after the battery module 2 is removed. Too little content of the fire extinguishing agent absorbs less heat and cannot meet the demand. The fire extinguishing agent comprises one or more of heptafluoropropane and hexafluoropropane. Heptafluoropropane and hexafluoropropane are both good chemical extinguishing agents, and the rapid reaction and excellent combustion inhibition of heptafluoropropane and hexafluoropropane can avoid the occurrence of catastrophic fires. In addition, the heptafluoropropane and the hexafluoropropane do not contain particles or greasy residues after release, are completely vaporized in the atmosphere without leaving residues, are non-conductive and cannot damage devices when extinguishing fire.

The panel 3 is also provided with a liquid level meter 9 for detecting the amount of fire extinguishing agent in the protective casing, so that the fire extinguishing agent can be observed and injected timely to avoid fire. Still be provided with Battery Management System (BMS), anodal post 7 and negative pole post 8 on the panel 3, battery management system (BMS)'s communication jack 11 still is located the outer terminal surface of panel 3, and Battery Management System (BMS) is used for carrying out a series of management to the battery, and anodal post 7 and negative pole post 8 are used for the charge-discharge of battery module 2. The panel 3 is further provided with a heat dissipation fin 12 for dissipating heat in the box body 1.

During the specific use, after the whole assembly was accomplished, container formula lithium cell normally worked, when battery module 2 began to take place the thermal runaway, the agent that puts out a fire in the protective housing heat absorption vaporization takes place the heat pipe reaction, with the temperature reduction in the box 1, when the heat rose to the uniform temperature, the agent that puts out a fire will consume limited oxygen in the airtight space, prevents that the thermal runaway from arousing naked light. The content of the added fire extinguishing agent can be checked regularly according to the requirement. Adding in time.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a can effectively prevent lithium cell energy storage system of thermal runaway which characterized in that, includes the box, be provided with accommodation space in the box, be provided with battery module in the accommodation space, a side lid of box is equipped with the panel, the panel will accommodation space encloses into airtight space, the agent of putting out a fire has been installed to the box, the boiling temperature of the agent of putting out a fire is far less than battery module thermal runaway's temperature, absorb certain heat when the agent of putting out a fire vaporizes, the chain reaction of the active free radical reaction interruptible burning in the free radical that the agent of putting out a fire thermal decomposition produced and the burning still is provided with Battery Management System (BMS) and positive and negative utmost point post on the panel, Battery Management System (BMS) and positive and negative utmost point post all with battery module electric connection.

2. The lithium battery energy storage system capable of effectively preventing thermal runaway according to claim 1, wherein: the volume of the fire extinguishing agent is more than 10% of the volume of the accommodating space after the battery module is removed.

3. The lithium battery energy storage system capable of effectively preventing thermal runaway according to claim 1 or 2, wherein: the fire extinguishing agent comprises heptafluoropropane or hexafluoropropane.

4. The lithium battery energy storage system capable of effectively preventing thermal runaway according to claim 1, wherein: still including annotating liquid mouth and level gauge, annotate the liquid mouth with the level gauge is located the panel or the periphery of box.

5. The lithium battery energy storage system capable of effectively preventing thermal runaway according to claim 1, wherein: the battery module passes through the stopper with the box is fixed, the stopper with still be provided with elastic buffer material between the battery module.

6. The lithium battery energy storage system capable of effectively preventing thermal runaway according to claim 1, wherein: the box body is preferably an aluminum profile box body or a cast aluminum box body.

7. The lithium battery energy storage system capable of effectively preventing thermal runaway according to claim 1, wherein: a sealing ring is also arranged between the box body and the panel; the sealing ring is arranged at the opening of the box body.

8. The lithium battery energy storage system capable of effectively preventing thermal runaway according to claim 7, wherein: the sealing ring is made of ethylene propylene diene monomer, and the contact surface of the sealing ring and the panel is wavy.

9. The lithium battery energy storage system capable of effectively preventing thermal runaway according to claim 1, wherein: and an elastic buffer part is arranged between the battery module and the bottom of the box body.

10. The lithium battery energy storage system capable of effectively preventing thermal runaway according to claim 1, wherein: the box body at least comprises two layers of protection shells, and the fire extinguishing agent is arranged between the protection shells.